Electrical relay.



A. W. COPLEY.

ELECTRICAL RELAY.

APPLICATION FILED 1uLY24. 19l2.

1 ,1 89,240. Patented July 4, 1916.

2 SHEETS-SHEET I.

A W. COPLEY.

ELECTRICAL RELAY.

APPLICAHON HLED IULY24, 19:2.

1 ,1 89,240. Patented July 4, 1916.

2 SHEETS-SHEET 2.

J \9 HgENTOR ITNESSES: F

CMOQSQYDLW UNITED STATES rA'rENT OFFICE.

ALMON W. COPLEY, OF WILKINSBURG, PENNSYLVANIA, ASSIG-NOR TO\VESTINGI-IOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPGRATION OFPENNSYLVANIA.

ELECTRICAL RELAY.

Application filed July 24, 1912.

To all whom it may concern Be it known that I, Armor: Corner, a citizenof the United States, and a resident of VVilkinsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Electrical Relays, of which the following is aspecification.

My invention relates to electrical relays, and particularly to suchrelays as are em ployed in connection with circuitbreakers and similarapparatus for the purpose of causing their operation upon the occurrenceof certain electrical conditions and continuance thereof forpredetermined periods of time.

The object of my invention is to provide a relay of the character andfor the purpose indicated whereby the period during which an abnormalelectrical condition must con tinue, before the relay will causeoperation of the device controlled by it, may be adjusted to besubstantially inversely as the value of the excessive electricalcondition, or which will permit of securing other desirable relationsbetween the value of the excessive electrical quantity and the periodduring which it must continue to cause op-- eration of the apparatuscontrolled thereby.

My invention is illustrated in the accompanying drawings, Figure 1 ofwhich is a View, in front elevation, of a device constructed inaccordance therewith, the cover of the device being removed to exposethe inclosed parts. Fig. 2 is a plan view of some of the parts of thedevice of Fig. 1. Fig. '3 is a view, in side elevation and in section,of the device of Fig. 1, and Fig. 1 is a diagrammatic view of theconnections of the device.

The operating parts of the device are inclosed within a casing,consisting of a back or base member 1 which serves as a support for saidparts and a removable cover 9, and they comprise a magnetizable core .3having two sets of poles 4 and 5 and 6, 7 and 8, respectively, that aredisposed upon opposite sides of a conducting disk 9 which constitutesthe movable element. The poles 1 and 5 are provided with a winding 10 toreceive current, preferably through a transformer 11, that isproportional to the voltage of a distributing circuit 1213 having acircuitbreaker 1 1, the operation of which is controlled by the presentrelay. The poles 6 and 8 are disposed upon opposite sides ofSpecification of Letters Patent.

Patented July 4, 1916.

SeriaI No. 711,205.

the pole T and are separated therefrom by suitable air gaps, they beingalso of oppo to insure a substantially similar mode of operation and anequivalent result, from which it will be understood that two torques arenormally exerted upon the movable ele ment 9 which are respectivelysubstantially proportional to the energy and to the square of thecurrent traversing the circuit 1218. In other words, the element 9 issubjected to opposing wattmcter and ammeter torques, the ammeter torquenormally acting also to oppose from its initial position movement of thedisk 9.

The movable element 9 is carried by a shaft 18 that is mounted insuitable bearings 19 andis provided at its upper end with a pinion 20 tomesh with a gear 21 that is mounted upon another shaft 22. The inner endof a spiral spring 23 is attached to the shaft 22 and the outer end ofthe spring is attached to a rotatively mounted arm 24:, the front end ofwhich is bent downwardly at right angles to the main portion thereof toprovide an index adjacent to the face of a scale 25, the downwardly bentend of the arm being also provided with an operating handle 26. The arm24k is movable through a limited range for the purpose of adjusting thetorque to be exerted by the spring 33 upon the shaft 22 and fordetermining the value of the electromagnetic torque which must beexerted upon the movable element 9 to cause rotation thereof. Thus, thearm 24L provides means for predetermining the current or energy value atwhich the relay will begin to operate.

Attached to the shaft 22, directly above the gear 21, is a resilientcontact-carrying arm 26, the outer end of which is normally maintainedin engagement with a stop 27 upon another rotatively mounted arm 28 thatis similar to the arm 24 and has its outer end bent upwardly inopposition to the downwardly bent end of the arm 24; and provided withan operating handle 29. The

outer end of the arm 26 is adapted to engage a resilient stationarycontact terminal 30 that is adjustably mounted upon one end oi? a screw31 carried by the frame of the instrument, the engagement of the saidparts being etlected only when an abnormal electrical condition hasexisted in the circuit 12 l3 tor a predetermined length of time. Thelength of the said period is predetermined by so adjusting the positionof the stop 2'! as to vary the distance through which the arm 26 mustmove in order to on page the stationary contact terminal 30, the greaterthe distance between the said members, the longer the said period. inorder that the arm 28 may not be moved in a COl1l1tC1CiOCl\YiSQdirection beyond the position of the arm 21, the latter arm is providedwith a stop that extends downwardly into the path of movement of thecontact-carrying arm 26. The contact carrying arm 26 connected to oneterminal oil a tripping coil of the circuit-breaker ll, and thestationary contact terminal 30 is connected to the other terminalthereof, a battery or any other suitable source of power being includedin the said circuit.

The dish 5 is retarded in its rotation by means of two electromagnetscomprising; core members 36, the poles of which are dis posed uponopposite sides of the disk, and coils 37 that are connected in serieswith the winding: 15, or are otherwise suitably arranged to receivecurrents that are substantialy proportional to the currenttraversing thecircuit 12l3. Since the coils are energized in proportion to the amountof current traversing the circuit to be protected, they e. L a greaterretarding effect upon the disk 9 at the higher current values than atthe lower values, and they consequently modify the characteristics orthe in strument. 'lhis modification of the characteristics is such tocause the period durinawhich an almormal condition must exist in orderto cause engagement of the contact terminals 26 and to be more nearly ininverse relation to the value of the overload upon the circuit 12*?)than would be the case it electron r etic damping means were notprovided. in fact, by proper adjustment of toe wndings and magneticcircuits, a substantia inverse relation of the said quantities i. beobtained through a considerable ran 'e of op ration, or othercharacteristics di 1 lug therefrom may be obtained, denred. reason ofthe provi of speed-reducing connection between the dis: 9 and thecontact-carrying arm 26, it is permissible for the disk to retate atsuch a speed that the electromagnets will exert a material retardingefiect there- 011. irccordingly, greater accuracy of adjustment of theperiod during which the abnormal condition must continue in order tocause the circuit-ln'ealrer to open is possible than would be the caseit the disk 9 made only a. partial revolution in ettecting engagement ofthe members 26 and 30.

lhe device is adapted to serve as an overload and reverse current relaywhen con nected as shown in Fig. l. but, it the windings 10 and l? arenot connected to the transformer 11 or to the circuit 12- 1 it willserve as an overload relay only.

will be readily understood that. although the device is particularlyuseful for the purpose of controlling the operation of acircuit-breaker, it may be employed for other purposes and in otherrelations, and also that it is not limited in its application to use inconnection with relay of the kind herein set for h, but may be employedgenerally wherever elect-rci gnetic dan'iping in proportion to thecurrenttraversing a circuit m be desirable.

I claim as my invention:

1. A relay for an electric circuit comprising a inagnetizable member, arotatable disk armature therefor, potential and current windings for themagnetizable member and an electromagnet for retarding the armature inaccordance with the current that traverses the circuit.

2. The combination with an alternatingcur ent circuit, of a relaycomprising a magnetizable member, a conducting armature that inductivelyactuated in accordance with the energy traversing the circuit, and

means for retarding the armature in accordance with the current thattraverses the circuit.

3. A relay for an electric circuit comprisina a stationary magnetizablemember, a dish armature, pi'itential and current windings surroundingthe masnetizablc member for actuating the armatur v in accordance withthe energy traversing the circuit, and two retardingelectromagnets torthe armature supplied with current in accordance with the currenttraversing the circuit.

4. A relay comprising a magnetizable member, current and potentialwindings therefor. a rotatable armature actuated by the magnetic linesof torce from the magnetizable member. and a laminated magnetizablemember having: a current winding thereon for retarding the armature.

In testimony whereof I have hereunto subscribed my name this 17th day ofJuly, 1912.

ALMON VT. COPLEY.

CLAYTON DILL, B. B. HINns.

Qopics of this patent may obtained for five cents each, by addressingthe Commissioner at Patents, Washington, D. G.

